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Difference between revisions of "GOCDB/Release4/Development/MultipleGRIS"

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<< Back to [[GOCDB/Documentation_Index]] <br/>
[[Category:GOCDB]]
<< Back to [[GOCDB/Release4/Development]] <br/>
Moved to [[GOCDB/Release4/Development/MultipleEndpointsPerService]]
 
=Multiple Endpoints=
==Introduction==
As requested in ticket https://rt.egi.eu/rt/Ticket/Display.html?id=3347. Make GOCDB capable of storing a GRIS URL field for each service endpoint. This will allow the Top-BDII to directly retrieve information about the endpoint.
 
To achieve this we propose adding support for multiple <Endpoint> elements per service (the Endpoint element in turn wraps a <URL>). For example, one Endpoint could define the actual service URL, a second could define the GRIS ldap URL, whilst a third could define an admin portal URL and so on.
 
Given that a Service would be able to define multiple endpoints, a mechanism is required to distinguish different endpoint types and their intended purpose. We propose using using a known interface name:
 
* As per GLUE2, Define a new <InterfaceName> tag as a child of <Endpoint>. For example, the Endpoint could define the service's GRIS ldap URL with a <InterfaceName> value of "RIS" (or maybe "ldap.RIS") representing an ldap endpoint to a Resource Information Service.
<!--# Define a new Endpoint 'InterfaceName' attribute, e.g. <Endpoint IntefaceName="ldap.RIS">
# Define an Endpoint sub-type specialisation such as <GRIS_Endpoint> (the GLUE2 extensibility mechanism. Currently not preferred due to increased complexity - requires XSD abstract elements and XSD substitution groups). -->
 
Adding multiple Endpoints per service is a more GLUE2 centric approach. Additional elements/attributes can be added to the GOCDB Endpoint if required. For more GOCDB/GLUE2 comparisons see [[GOCDB/Release4/Development/GLUE2Compatibility]].
 
==Implementation==
When adding or editing a service we propose that a user can add multiple child Endpoint objects. 
 
The GOCDB-PI output will be extended for nesting multiple child <Enpoint> elements within a parent <SERVICE_ENDPOINT>. Each <Endpoint> nests the child <URL> and an <InterfaceName>. Using this mechanism the Top-BDII can retrieve a filtered list of endpoints that support a URL with the requied interface (e.g. "RIS" or maybe even "ldap.RIS" to indicate the URL protocol scheme).
 
GOCDB would centrally manage an enumeration of <InterfaceName>s. Each type of InterfaceName would be documented similar to [[GOCDB/Input_System_User_Documentation#Service_types|service types]]. Endpoint URLs that nest a particular InterfaceName MUST fully support that particular interface type (which is the intended purpose of a standard interface).
 
==PI Examples==
Query String:
https://goc.egi.eu/gocdbpi/private/?method=get_service_endpoint&InterfaceName=RIS
 
<source lang="XML">
<?xml version="1.0" encoding="UTF-8"?>
<results>
  <SERVICE_ENDPOINT PRIMARY_KEY="50257G0">
      <PRIMARY_KEY>50257G0</PRIMARY_KEY>
      <HOSTNAME>dgiref-globus.fzk.de</HOSTNAME>
      <GOCDB_PORTAL_URL>https://goc.egi.eu/portal/index.php?Page_Type=View_Object&amp;object_id=77182&amp;grid_id=0</GOCDB_PORTAL_URL>
      <HOST_OS>SL5</HOST_OS>
      <BETA>N</BETA>
      <SERVICE_TYPE>GRAM5</SERVICE_TYPE>
      <CORE></CORE>
      <IN_PRODUCTION>Y</IN_PRODUCTION>
      <NODE_MONITORED>Y</NODE_MONITORED>
      <SITENAME>DGIREF</SITENAME>
      <COUNTRY_NAME>Germany</COUNTRY_NAME>
      <COUNTRY_CODE>DE</COUNTRY_CODE>
      <ROC_NAME>NGI_DE</ROC_NAME>
      <ENDPOINT>
        <URL>ldap://ce-cms.vinca.rs:2170/mds-vo-name=AEGIS10-VINCA-CMS,o=grid</URL>
        <InterfaceName>RIS</InterfaceName>
      </ENDPOINT> 
      <!-- More Endpoints not shown -->
      ...
</SERVICE_ENDPOINT>
</source>
 
      <!-- 
      <ENDPOINT InterfaceName="RIS">
        <URL>ldap://ce-cms.vinca.rs:2170/mds-vo-name=AEGIS10-VINCA-CMS,o=grid</URL>
      <ENDPOINT>
      <GRIS_ENDPOINT>
        <URL>ldap://ce-cms.vinca.rs:2170/mds-vo-name=AEGIS10-VINCA-CMS,o=grid</URL>
      <GRIS_ENDPOINT> -->

Latest revision as of 16:53, 23 October 2013